Had a perfectly ripe Tecklenberg Farms melon (Ambrosia?) last night.
These are the only people I know who currently sell genuinely ripe melons of the cantaloupe / muskmelon type. (Having lived in Rome, home of the cantaloupe, and grown up in the Central Valley before the industry switched to the modern hybrids that tip off green, I have high standards.)
They have a stand at the Wednesday College of San Mateo farmers market, and in past years I've also found them at the Concord Tuesday market. I don't know if they're at the CSM Saturday market or the Concord Thursday market.